linux-kernel - [tip:tracing/urgent] tracing: Fix lockdep warning in global

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Date:	Sat, 27 Mar 2010 02:03:57 GMT
From:	tip-bot for Li Zefan <lizf@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, a.p.zijlstra@...llo.nl, lizf@...fujitsu.com,
	tglx@...utronix.de
Subject: [tip:tracing/urgent] tracing: Fix lockdep warning in global_clock()

Commit-ID:  581fe9449d181f6bd5afc5dcae37526eeee02b1d
Gitweb:     http://git.kernel.org/tip/581fe9449d181f6bd5afc5dcae37526eeee02b1d
Author:     Li Zefan <lizf@...fujitsu.com>
AuthorDate: Wed, 24 Mar 2010 10:57:37 +0800
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Fri, 26 Mar 2010 15:41:59 -0400

tracing: Fix lockdep warning in global_clock()

# echo 1 > events/enable
 # echo global > trace_clock

------------[ cut here ]------------
WARNING: at kernel/lockdep.c:3162 check_flags+0xb2/0x190()
...
---[ end trace 3f86734a89416623 ]---
possible reason: unannotated irqs-on.
...

There's no reason to use the raw_local_irq_save() in trace_clock_global.
The local_irq_save() version is fine, and does not cause the bug in lockdep.

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Li Zefan <lizf@...fujitsu.com>
LKML-Reference: <4BA97FA1.7030606@...fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace_clock.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 6fbfb8f..9d589d8 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -84,7 +84,7 @@ u64 notrace trace_clock_global(void)
 	int this_cpu;
 	u64 now;
 
-	raw_local_irq_save(flags);
+	local_irq_save(flags);
 
 	this_cpu = raw_smp_processor_id();
 	now = cpu_clock(this_cpu);
@@ -110,7 +110,7 @@ u64 notrace trace_clock_global(void)
 	arch_spin_unlock(&trace_clock_struct.lock);
 
  out:
-	raw_local_irq_restore(flags);
+	local_irq_restore(flags);
 
 	return now;
 }
--
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